Asteroid - Revision history

BenLH at 01:10, 26 May 2019

2019-05-26T01:10:47Z

BenLH at 00:45, 26 May 2019

2019-05-26T00:45:19Z

BenLH at 00:20, 26 May 2019

2019-05-26T00:20:35Z

Farred: addition

2013-08-09T03:30:52Z

addition

Farred: /* Asteroids as potential sources of water */ adding link

2012-05-09T13:28:44Z

Asteroids as potential sources of water: adding link

Farred: supplying missing word, formatting statement

2012-05-09T13:03:40Z

supplying missing word, formatting statement

Farred: correction

2012-05-09T12:54:27Z

correction

Farred: correction

2012-05-09T12:51:19Z

correction

76.76.146.52: /* Robotic miner/tankers */ Hayabusa

2009-01-19T01:02:33Z

Robotic miner/tankers: Hayabusa

76.76.146.52: /* Robotic miner/tankers */

2009-01-19T00:35:33Z

Robotic miner/tankers

← Older revision		Revision as of 01:10, 26 May 2019
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	[https://www.asteroidanalytics.com/planetary-defense-characterization-part-2 Planetary Defense - Characterization (Part 2)]		[https://www.asteroidanalytics.com/planetary-defense-characterization-part-2 Planetary Defense - Characterization (Part 2)]
		+
		+	[https://www.asteroidanalytics.com/neo-threat-summary-chart-2018 The "Threat" of Asteroid Impacts - Breaking Down the Comprehensive Chart by the US Government]
		+
		+	==Asteroid mining==
		+	[https://www.asteroidanalytics.com/asteroid-mining-is-not-dead Asteroid mining is (not) dead]
		+
		+	[https://www.asteroidanalytics.com/asteroid-mining-first-mission-off-ground Asteroid Mining: Getting the first mission off the ground]

	==Asteroids as potential sources of water==		==Asteroids as potential sources of water==

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 *[http://en.wikipedia.org/wiki/Comet Wikipedia:Comets]
 *[https://www.asteroidanalytics.com Asteroid Analytics]
 == Reference ==

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 In terms of Lunar and other space development the main questions boil down to these two: 1)What chance do you or your base stand of getting hit by one? 2)Are the asteroids a better source of water than the [[moon]]?
 ==Categories of Asteroids ranked by semi-axis distance==
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 The current calculated risk of an astronaut on the moon being hit with a [[micrometeorite]] is 0.0003 per six hour period ([[Lunar Base handbook]] p.526).  Assuming the same flux for the Earth and moon then for meteoroids larger than 10 microns in diameter, the rate of impact is 1 per square meter per year.<ref>McGRAW-HILL ENCYCLOPEDIA OF Science & Technology, 8th Edition, (c)1997 volume 11, page 151.</ref>  The odds of getting hit by anything bigger assumes you did not pick it up via [[radar]] and blast it. The bigger concern involves [[comets]] and dusty [[NEO]]s that get too close. This could cause a rain of medium velocity particles with a fairly intense flux. As seen with the annual [[comet]] swarms, their trails extend for millions of kilometers and vary tremendously in concentration.
 ==Asteroids as potential sources of water==
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 *[http://en.wikipedia.org/wiki/Asteroids Wikipedia:Asteroids]
 *[http://en.wikipedia.org/wiki/Comet Wikipedia:Comets]
 == Reference ==

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 ==Lunar [[Meteorite]] Hazard==
-The current calculated risk of an astronaut on the moon being hit with a [[micrometeorite]] is 0.0003 per six hour period ([[Lunar Base handbook]] p.526). The odds of getting hit by anything bigger assumes you did not pick it up via [[radar]] and blast it. The bigger concern involves [[comets]] and dusty [[NEO]]s that get too close. This could cause a rain of medium velocity particles with a fairly intense flux. As seen with the annual [[comet]] swarms, their trails extend for millions of kilometers and vary tremendously in concentration.
+The current calculated risk of an astronaut on the moon being hit with a [[micrometeorite]] is 0.0003 per six hour period ([[Lunar Base handbook]] p.526).  Assuming the same flux for the Earth and moon then for meteoroids larger than 10 microns in diameter, the rate of impact is 1 per square meter per year.<ref>McGRAW-HILL ENCYCLOPEDIA OF Science & Technology, 8th Edition, (c)1997 volume 11, page 151.</ref>  The odds of getting hit by anything bigger assumes you did not pick it up via [[radar]] and blast it. The bigger concern involves [[comets]] and dusty [[NEO]]s that get too close. This could cause a rain of medium velocity particles with a fairly intense flux. As seen with the annual [[comet]] swarms, their trails extend for millions of kilometers and vary tremendously in concentration.
 ==Asteroids as potential sources of water==
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 *[http://en.wikipedia.org/wiki/Asteroids Wikipedia:Asteroids]
 *[http://en.wikipedia.org/wiki/Comet Wikipedia:Comets]
-−
 [[Category:Solar System]]
 [[Category:Mining Locations]]
 [[Category:Water Supply]]

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 The major drawback to all asteroid development is the distance involved. Unlike the moon which is close enough where a round trip journey takes a few days, round trip journeys to asteroids take several years using standard [[rocket]]s. This means that an investor would have to wait years to get a return on their investment, making it economically less attractive than the Moon.
-Also, with remotely control [[robot]]s from Earth, you are looking at delays of 12-30 minutes before a command is received.
+Also, with [[Progress in Remotely Operated Equipment|remotely control robot]]s from Earth, you are looking at delays of 12-30 minutes before a command is received.
 Astronauts will have to be in transit for years unless you can afford a very large [[rocket]], or use [[nuclear propulsion]]. Although Mars has a deep gravity well, at Mars you can at least count on [[aerobrake|aerobraking]] to slow you down. Not so at the asteroids, although the asteroids are most attractive because they have a very shallow gravity well making it easier to recover material from them. Lastly it is very cold on most of these asteroids and that can cause all sorts of problems when the temperature drops to 50 [[kelvin]] in the shade.

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 Asteroids are a class of small astronomical objects (minor planets, [[Comet|Comets]]) that orbit the sun. The moons of [[Mars]] may have been asteroids that were captured. Those in highly irregular orbits are likely to be the baked rocky cores of comets that have long since lost most if not all of their [[volatiles|volatile gasses]]. In terms of size asteroids range from the biggest 1 [[Ceres]] at about 930 kilometers in diameter to objects of a couple hundred tons of mass. Smaller objects are considered [[Meteorite|Meteorites]] or [[Comet Debris]].
-In terms of Lunar and other space development the main boil down to these two. What chance do you or your base stand of getting hit by one? Are the asteroids a better source of water than the [[moon]]?
+In terms of Lunar and other space development the main questions boil down to these two: 1)What chance do you or your base stand of getting hit by one? 2)Are the asteroids a better source of water than the [[moon]]?
 ==Categories of Asteroids ranked by semi-axis distance==

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 {{Fork2space}}
-Asteroids are a class of small astronomical objects (minor planets, [[Comet|Comets]]) that orbit the sun. The moons of [[Mars]] most likely were asteroids that were captured. Those in highly irregular orbits are likely to be the baked rocky core of comets that have long since lost most if not all of their [[volatiles|volatile gasses]]. In terms of size asteroids range from the biggest 1 [[Ceres]] at about 930 kilometers in diameter to objects of a couple hundred tons of mass. Smaller objects are considered [[Meteorite|Meteorites]] or [[Comet Debris]].
+Asteroids are a class of small astronomical objects (minor planets, [[Comet|Comets]]) that orbit the sun. The moons of [[Mars]] may have been asteroids that were captured. Those in highly irregular orbits are likely to be the baked rocky cores of comets that have long since lost most if not all of their [[volatiles|volatile gasses]]. In terms of size asteroids range from the biggest 1 [[Ceres]] at about 930 kilometers in diameter to objects of a couple hundred tons of mass. Smaller objects are considered [[Meteorite|Meteorites]] or [[Comet Debris]].
 In terms of Lunar and other space development the main boil down to these two. What chance do you or your base stand of getting hit by one? Are the asteroids a better source of water than the [[moon]]?

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 ==Robotic miner/tankers==
-One possibility is a robotic spacecraft acting as a combination miner and tanker. The only abundant energy source in interplanetary space is sunlight, which points to some form of [[ion propulsion]] or [[solar sail]]. The probe would sync orbits and dock with a small icy asteroid with negligible surface gravity. Solar power (either electrical or via reflectors) would be used to heat the asteroid surface, releasing volatiles such as water vapor which would be captured and condensed into storage tanks. A portion of the collected volatiles could then be used as ion thruster reaction mass for the return journey.
+One possibility is a robotic spacecraft acting as a combination miner and tanker. The only abundant energy source in interplanetary space is sunlight, which points to some form of [[ion propulsion]] or [[solar sail]]. The probe would sync orbits and dock with a small icy asteroid with negligible surface gravity. Such a maneuver has already been successfully attempted by the Japanese [[Hayabusa]] mission. Solar power (either electrical or via reflectors) would be used to heat the asteroid surface, releasing volatiles such as water vapor which would be captured and condensed into storage tanks. A portion of the collected volatiles could then be used as ion thruster reaction mass for the return journey.
 Both ion propulsion and solar sailing give continuous but very low thrust, so trips would be long term enterprises lasting decades.  The long return times could be made up for in volume; mass production of such water mining craft would amortize the initial design investment and tooling over hundreds of trips.